<?php
#
# Portable PHP password hashing framework.
#
# Version 0.3 / genuine.
#
# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
# the public domain.  Revised in subsequent years, still public domain.
#
# There's absolutely no warranty.
#
# The homepage URL for this framework is:
#
#	http://www.openwall.com/phpass/
#
# Please be sure to update the Version line if you edit this file in any way.
# It is suggested that you leave the main version number intact, but indicate
# your project name (after the slash) and add your own revision information.
#
# Please do not change the "private" password hashing method implemented in
# here, thereby making your hashes incompatible.  However, if you must, please
# change the hash type identifier (the "$P$") to something different.
#
# Obviously, since this code is in the public domain, the above are not
# requirements (there can be none), but merely suggestions.
#
	class PasswordHash {
		var $itoa64;
		var $iteration_count_log2;
		var $portable_hashes;
		var $random_state;
	
		function PasswordHash(\HashConfig $hashConfig)
		{
			$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
	
			if ($hashConfig->m_CL2 < 4 || $hashConfig->m_CL2 > 31)
				$hashConfig->m_hashCostLog2 = 8;
			$this->iteration_count_log2 = $hashConfig->m_CL2;
	
			$this->portable_hashes = $hashConfig->m_P;
	
			$this->random_state = microtime();
			if (function_exists('getmypid'))
				$this->random_state .= getmypid();
		}
	
		function get_random_bytes($count)
		{
			$output = '';
			if (is_readable('/dev/urandom')) {
				if ($fh = @fopen('/dev/urandom', 'rb')) {
					$output = fread($fh, $count);
					fclose($fh);
				}
			}
	
			if (strlen($output) < $count) {
				$output = '';
				for ($i = 0; $i < $count; $i += 16) {
					$this->random_state =
					    md5(microtime() . $this->random_state);
					$output .=
					    pack('H*', md5($this->random_state));
				}
				$output = substr($output, 0, $count);
			}
	
			return $output;
		}
	
		function encode64($input, $count)
		{
			$output = '';
			$i = 0;
			do {
				$value = ord($input[$i++]);
				$output .= $this->itoa64[$value & 0x3f];
				if ($i < $count)
					$value |= ord($input[$i]) << 8;
				$output .= $this->itoa64[($value >> 6) & 0x3f];
				if ($i++ >= $count)
					break;
				if ($i < $count)
					$value |= ord($input[$i]) << 16;
				$output .= $this->itoa64[($value >> 12) & 0x3f];
				if ($i++ >= $count)
					break;
				$output .= $this->itoa64[($value >> 18) & 0x3f];
			} while ($i < $count);
	
			return $output;
		}
	
		function gensalt_private($input)
		{
			$output = '$P$';
			$output .= $this->itoa64[min($this->iteration_count_log2 +
				((PHP_VERSION >= '5') ? 5 : 3), 30)];
			$output .= $this->encode64($input, 6);
	
			return $output;
		}
	
		function crypt_private($password, $setting)
		{
			$output = '*0';
			if (substr($setting, 0, 2) == $output)
				$output = '*1';
	
			$id = substr($setting, 0, 3);
			# We use "$P$", phpBB3 uses "$H$" for the same thing
			if ($id != '$P$' && $id != '$H$')
				return $output;
	
			$count_log2 = strpos($this->itoa64, $setting[3]);
			if ($count_log2 < 7 || $count_log2 > 30)
				return $output;
	
			$count = 1 << $count_log2;
	
			$salt = substr($setting, 4, 8);
			if (strlen($salt) != 8)
				return $output;
	
			# We're kind of forced to use MD5 here since it's the only
			# cryptographic primitive available in all versions of PHP
			# currently in use.  To implement our own low-level crypto
			# in PHP would result in much worse performance and
			# consequently in lower iteration counts and hashes that are
			# quicker to crack (by non-PHP code).
			if (PHP_VERSION >= '5') {
				$hash = md5($salt . $password, TRUE);
				do {
					$hash = md5($hash . $password, TRUE);
				} while (--$count);
			} else {
				$hash = pack('H*', md5($salt . $password));
				do {
					$hash = pack('H*', md5($hash . $password));
				} while (--$count);
			}
	
			$output = substr($setting, 0, 12);
			$output .= $this->encode64($hash, 16);
	
			return $output;
		}
	
		function gensalt_extended($input)
		{
			$count_log2 = min($this->iteration_count_log2 + 8, 24);
			# This should be odd to not reveal weak DES keys, and the
			# maximum valid value is (2**24 - 1) which is odd anyway.
			$count = (1 << $count_log2) - 1;
	
			$output = '_';
			$output .= $this->itoa64[$count & 0x3f];
			$output .= $this->itoa64[($count >> 6) & 0x3f];
			$output .= $this->itoa64[($count >> 12) & 0x3f];
			$output .= $this->itoa64[($count >> 18) & 0x3f];
	
			$output .= $this->encode64($input, 3);
	
			return $output;
		}
	
		function gensalt_blowfish($input)
		{
			# This one needs to use a different order of characters and a
			# different encoding scheme from the one in encode64() above.
			# We care because the last character in our encoded string will
			# only represent 2 bits.  While two known implementations of
			# bcrypt will happily accept and correct a salt string which
			# has the 4 unused bits set to non-zero, we do not want to take
			# chances and we also do not want to waste an additional byte
			# of entropy.
			$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
	
			$output = '$2a$';
			$output .= chr(ord('0') + $this->iteration_count_log2 / 10);
			$output .= chr(ord('0') + $this->iteration_count_log2 % 10);
			$output .= '$';
	
			$i = 0;
			do {
				$c1 = ord($input[$i++]);
				$output .= $itoa64[$c1 >> 2];
				$c1 = ($c1 & 0x03) << 4;
				if ($i >= 16) {
					$output .= $itoa64[$c1];
					break;
				}
	
				$c2 = ord($input[$i++]);
				$c1 |= $c2 >> 4;
				$output .= $itoa64[$c1];
				$c1 = ($c2 & 0x0f) << 2;
	
				$c2 = ord($input[$i++]);
				$c1 |= $c2 >> 6;
				$output .= $itoa64[$c1];
				$output .= $itoa64[$c2 & 0x3f];
			} while (1);
	
			return $output;
		}
	
		function HashPassword($password)
		{
			$random = '';
	
			if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
				$random = $this->get_random_bytes(16);
				$hash =
				    crypt($password, $this->gensalt_blowfish($random));
				if (strlen($hash) == 60)
					return $hash;
			}
	
			if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
				if (strlen($random) < 3)
					$random = $this->get_random_bytes(3);
				$hash =
				    crypt($password, $this->gensalt_extended($random));
				if (strlen($hash) == 20)
					return $hash;
			}
	
			if (strlen($random) < 6)
				$random = $this->get_random_bytes(6);
			$hash =
			    $this->crypt_private($password,
			    $this->gensalt_private($random));
			if (strlen($hash) == 34)
				return $hash;
	
			# Returning '*' on error is safe here, but would _not_ be safe
			# in a crypt(3)-like function used _both_ for generating new
			# hashes and for validating passwords against existing hashes.
			return '*';
		}
	
		function CheckPassword($password, $stored_hash)
		{
			$hash = $this->crypt_private($password, $stored_hash);
			if ($hash[0] == '*')
				$hash = crypt($password, $stored_hash);
	
			return $hash == $stored_hash;
		}
	}
?>
